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a lot of work

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- round to nearest instead of round to zero in SMS period calc
- implement arpeggio
- implement arp macro (kinda)
- polish the SMS platform
- correct the DIV_CMD_PITCH range to 1 semitone
- fix PSG volume in Genesis
- use a better register write strat in Genesis
- fix a bug caused by legacy code
- implement ECxx command
- implement EDxx command
- implement SN noise mode command
- vibrato table is now 64 positions long (instead of 60)
This commit is contained in:
tildearrow 2021-05-16 03:03:23 -05:00
parent f2c70df4a8
commit dbc2e6285f
12 changed files with 264 additions and 173 deletions
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39
src/engine/platform/sms.cpp
View file

@ -2,7 +2,7 @@
#include "../engine.h"
#include <math.h>
void DivPlatformSMS::acquire(short& l, short& r) {
void DivPlatformSMS::acquire(int& l, int& r) {
short v;
sn->sound_stream_update(&v,1);
l=v;
@ -13,10 +13,14 @@ void DivPlatformSMS::tick() {
for (int i=0; i<4; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) sn->write(0x90|(i<<5)|(15-((chan[i].vol*chan[i].std.vol)>>4)));
if (chan[i].std.hadArp) {
chan[i].baseFreq=round(1712.0f/pow(2.0f,((float)(chan[i].note+chan[i].std.arp-12)/12.0f)));
chan[i].freqChanged=true;
}
}
for (int i=0; i<3; i++) {
if (chan[i].freqChanged) {
chan[i].freq=(chan[i].baseFreq*(2048-chan[i].pitch))>>11;
chan[i].freq=(chan[i].baseFreq*(ONE_SEMITONE-chan[i].pitch))/ONE_SEMITONE;
sn->write(0x80|i<<5|(chan[i].freq&15));
sn->write(chan[i].freq>>4);
chan[i].freqChanged=false;
@ -24,7 +28,7 @@ void DivPlatformSMS::tick() {
}
if (chan[3].freqChanged || updateSNMode) {
updateSNMode=false;
chan[3].freq=(chan[3].baseFreq*(2048-chan[3].pitch))>>11;
chan[3].freq=(chan[3].baseFreq*(ONE_SEMITONE-chan[3].pitch))/ONE_SEMITONE;
chan[3].freqChanged=false;
if (snNoiseMode&2) { // take period from channel 3
if (snNoiseMode&1) {
@ -47,7 +51,7 @@ void DivPlatformSMS::tick() {
int DivPlatformSMS::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON:
chan[c.chan].baseFreq=1712/pow(2.0f,((float)c.value/12.0f));
chan[c.chan].baseFreq=round(1712.0f/pow(2.0f,((float)c.value/12.0f)));
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
chan[c.chan].active=true;
@ -61,7 +65,7 @@ int DivPlatformSMS::dispatch(DivCommand c) {
break;
case DIV_CMD_INSTRUMENT:
chan[c.chan].ins=c.value;
chan[c.chan].std.init(parent->song.ins[chan[c.chan].ins]);
//chan[c.chan].std.init(parent->song.ins[chan[c.chan].ins]);
break;
case DIV_CMD_VOLUME:
chan[c.chan].vol=c.value;
@ -71,10 +75,35 @@ int DivPlatformSMS::dispatch(DivCommand c) {
chan[c.chan].pitch=c.value;
chan[c.chan].freqChanged=true;
break;
case DIV_CMD_NOTE_PORTA: {
int destFreq=round(1712.0f/pow(2.0f,((float)c.value2/12.0f)));
bool return2=false;
if (destFreq>chan[c.chan].baseFreq) {
chan[c.chan].baseFreq+=c.value;
if (chan[c.chan].baseFreq>=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
} else {
chan[c.chan].baseFreq-=c.value;
if (chan[c.chan].baseFreq<=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
}
chan[c.chan].freqChanged=true;
if (return2) return 2;
break;
}
case DIV_CMD_STD_NOISE_MODE:
snNoiseMode=(c.value&1)|((c.value&16)>>3);
updateSNMode=true;
break;
case DIV_CMD_LEGATO:
chan[c.chan].baseFreq=round(1712.0f/pow(2.0f,((float)c.value/12.0f)));
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
break;
default:
break;
}